I have already explained, Error detection techniques in this video.click the link.
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Hamming code is an Easy Error detection & Correction Technique,developed by R.W.Hamming.

Hamming Code is used to detect Exact Error Bit Position.

To find redundant bits, following rule has to be satisfied.

2^r should be greater than or equal to d + r + 1.


Where, d is data bits
r ? redundant bits
If d is 7, value of r should be 4, to satisfy rule. So totally 11 bits are transmitted.

It is well explained with example.

before sending the data bits,parity bits are calculated, then data is sent . After receiving the data, parity bits are recalculated.if value of parity bits are changed on receiver side, those parity bit numbers are added to find the exact position of error location.

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